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I like to send composite video (no audio) from basement to another room in the house over an existing RG6 coax cable in the house. I am not trying to send audio, since it's only video, can I do following?

Basically I am trying to use my existing coax wire to send video from my security system DVR unit to a room. I tried above but I get no signal, what am I missing? I am thinking modulation is not necessary since I don't care about audio.

Yep, that should work. As long as your using a composite input on the TV, not an RF input expecting a modulated signal.
Is the coax line "dedicated" to that run - meaning it's not going through splitters or otherwise carrying CATV service?
Might try it with a TV in the same room just to make sure you're sending a signal at all from the camera.
Jeff

Thanks. Actually if I hook up a good old RCA cable from DVR to a TV, it works fine. But when I use the Fconnector-to-RCA adapters on each end, I get no signal to the same TV. Another thing was going to try was cut off the coax connectors on each end and connect RCA connectors and see if that work.

Actually all coax wires from all rooms are coming to a central wiring panel but I am not going through any distribution module, etc. Last night, I did a little test where I used F-connector-to-RCA adapter to both ends of a 6ft coax cable and used that to connect DVR's composite monitor output to a TV's RCA input. It worked fine, so I confirmed that I can use coax to carry composite video.

Then, I connected same F-connector-to-RCA adapters to the coax cable going to a room on 2nd floor (about 40-50ft length) and hooked up to DVR's monitor out and same TV, no signal !

I believe coax is fine because I tried sending Dish Network signal over it and it works fine. Could length be an issue?